Propeller



Jan. 5,1932. J. SQU 1,839,811

PRQPELLER Filed Feb. 15, 1929 &1.

A TTORNE Y I Patented Jan. 5, i932 I I. I i

' UNITED STATES" PATENT. OFFICE :roniv seumus, on DETROIT, moment v PROPELLER Applicationfil ed l ebruary 15, 1929'. Serial No. 340,059.

This invention relates to'propeller blades Fig. 4 is a sectional view on line H of and more particularly to blades adapted to Fig, 2. p or intended .for aeronautical use. Fig. 5 is a view similar to Fig. 4 showing For various reasons it is desirable to fabri a modified form of my invention.

' a 5 cate airplane propellers of hollow construc- I have shown a propeller consisting of a 55 gether by any suitable means. -A- common tegrally formed with the blades.

' tion. Various means have been utilized for pair of blades 5' and hub 6. It will be readily making blades of this character. Among understood that the separate hub 6 may be seother means is the provision of stamped or cured to the blades 5 by-any one of severalotherwise formed parts which are secured towell known means or that the hub may be inexpedient is to weld the adjacent edges of the As shown, the blades are of airfoilform pieces together so as to form a hollow conand comprise three parts or pieces 7, 8 and 9. struc tion. This welding frequently occurs The pieces 7 and 9 form the top and bottom along the leading edge or face of the blade of the blades while the piece 8 formsthe or along the trailing edge offace thereof, front or leading edge thereof. The piece8 is 65 or both. i of generally U'shaped formation and is. se- A desirable shape of propeller blade is an, cured at the ends'of the legs of the U to the airfoil form andin constructions of that type pieces 7 and 8 by welding as at 10 and 11 rethe leading edge of the blade is round while spectively. In this manner the leading edges the trailing edge is sharp. In this type of of the blades will not contain a weld and are, 70 blade the portions which are most severely therefore,'much better able to withstand the attacked by various elements, including rain, ravages of the elements in operation. hail or the like, are the leading and trailing -As will be seen in Fig.4, the trailing edges edges. Because of the fact that the welded of the blades are sharp. The edge is formed portions of the blade are not ashard or as by the end of the piece 9. The piece 7 ter- 76 dense as a cast,'rolled orforged-metal can minates short of the edge 'ofthe piece 9 and be made, it quite often happens that the life may be welded thereto as at 12, the weld likeof the propeller is considerably shortened be- Wise terminating short of the edge of the cause the weakest portions of the blades are piece 9 o th t it i adjacent to but removed subjected to the greatest damage from the from the trailing edge of the blade. 80 l en Inthe construction as shown in Fig. 5 the Among h O j of my invention, theretrailing edges-of the pieces 7 and 9 aresubis the f b g 0f P P blade tantially coincident and a separate piece 13 is from a plurallty of Parts lo together at secured' thereto by'welding as at 14 so that With-the above and other objects in view, blade, removed fromlthe weld my it t Consists in f fl s .While-Ihave herein disclosed one form of com inatlon and construction 0 t evarlous my invention I desireit to be understood parts of my improved device as d'escribedin the specification, claimed in my claims and t vailous =m fi i i z shown in the accompanyin drawings, in maclewlfltout mg 1 t e Spln o.

i h v my 1nvent1on. have described the parts of- I Fig. 1 is a front elevation of a propeller P blades 218198111; secured together by Weld e b d i my i v ti ing, but I deslre- 1t to be understood that the Fi 2 i a i rtl i ti d t word welded is used in a generic sense. 95

ly in elevation of one blade of the propeller h t I im and the hub thereof. i -1. Apropeller blade comprisingaplurallty 4 Fig. 3 is a-view taken-on line3-3 of the of parts welded together, substantlally the propeller blade disclosed inFig. 2, the-hub entire leading portion of the blade compris- 5 portion of the propeller being omitted. ing a separate part of generally U shaped the points other than those above pointed out. Said piece forms the trailing edge of the cross section welded at the ends of the U to other portions of the blade.

2. A propeller blade comprising at least three parts welded together, substantially the entire leading edge of the blade being rounded, said blade being provided with'a longitudinal weld adjacent to but removed from both sides of said leading edge.

3. A propeller blade comprising a plurality of parts welded together, said blade having a longitudinal weld over substantially its entire length located on each side of said blade adjacent to but removed from the leading edge thereof.

4. A hollow metallic propeller blade made up of at least three parts forming the exte:

rior surface of said blade and joined to each other over substantially the entire length of said blade along lines removed from the leading and trailing edges of said blade.

5. A hollow metal propeller blade the exterior surface of which throughout substantially the entire length of said blade is made up of a pair of side members and nose member welded to said side members along lines rea-rwardly removed, from the leading edge of said blade. I

6. A hollow metallic propeller blade the exterior surface of which for substantially the entire length thereof is formed of three portions welded together.

7. A hollow metallic propeller blade the exterior surface of which for substantially the entire length thereof is formed of three portions welded together along lines removed from the leading edge of said blade.

8. A hollow metallic propeller blade, the exterior surface of which for substantially the entire length thereof is formed of three- I portions welded together along lines removed from both the leading and trailing edges of said blade.

Y JOHN SQUIRES. 

